dioptrical

Variant of dioptric

dioptric definition

di·op·tric (dī äp′trik)

adjective

  1. of optical lenses or the method of numbering them according to their refractive powers; dioptral
  2. of dioptrics; refractive
  3. helping the sight by refractive correction

Etymology: Gr dioptrikos, relating to the diopter

Also dioptrical di·op′·tri·cal

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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